Citation:
CONG Yan-Qing, LI Zhe, WANG Qi, ZHANG Yi, XU Qian, FU Fang-Xia. Enhanced Photoeletrocatalytic Activity of TiO2 Nanotube Arrays Modified with Simple Transition Metal Oxides (Fe2O3, CuO, NiO)[J]. Acta Physico-Chimica Sinica,
;2012, 28(06): 1489-1496.
doi:
10.3866/PKU.WHXB201203221
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Composite electrodes consisting of highly ordered, vertically oriented TiO2 nanotube (TiO2-NT) arrays modified with Fe2O3, CuO, and NiO nanoparticles were successfully fabricated by a simple electrochemical anodization and electrodeposition method. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-Vis diffuse reflectance spectroscopy were used to characterize the structure and optical properties of the resulting Fe2O3/TiO2-NT, CuO/TiO2-NT, and NiO/TiO2-NT composite electrodes. The photoelectrochemical (PEC) activities of the composite electrodes were evaluated using phenol as a model pollutant. Results indicated that transition metal oxide nanoparticles were deposited on the mouth, tube wall, and base of the TiO2-NTs. The PEC activity of the composite electrodes was over twice that of an unmodified TiO2-NT electrode. The Fe2O3/TiO2-NT electrode showed the highest absorption intensity in the visible light region. After treatment for 120 min, the phenol removal efficiency using the Fe2O3/TiO2-NT anode could reach 96%, while it was only 41% for the unmodified TiO2-NT anode. Moreover, the Fe2O3/TiO2-NT electrode tended to generate intermediates of low toxicity. The higher PEC activity of the composite electrodes was attributed to the presence of hetero-nanostructures with high interfacial area comprised of TiO2-NTs and transition metal oxide nanoparticles, which efficiently facilitated electron transfer and inhibited the recombination of photogenerated electron- hole pairs.
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Keywords:
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TiO2 nanotube
, - Fe2O3,
- CuO,
- NiO,
- Photoelectrocatalysis,
- Visible light
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